You should get into the habit and trying thrice, leaving, rinse and repeat (I actually don't even try to solve it and pick the first 3)...Eventually, the correct one will appear in the first 3 choices.----First in the world to find the 12-digit (4 Power Node) Dead Space Code (YXYXXYXXYXXY)-#1 'Team Score' on 24 out of 29 Gears of War 2 Horde Leaderboards

Try 3 words, then do the bracket checks any brackets on a single line with no words between them {}, [], (), <>. when you hover over the left bracket the whole bracket will lite up and click it and either it will remove a dud and if you are lucky you get your tries replenished so try 3 more times. and if you didn't get it them power off the terminal and try again.

Or if you have the skill level and you cba to keep quickloading (or if you get locked out) use the command unlock. Or you could download the mod which removes the need to hack computers and lockpick doors. If you have the skill level you'll automatically open them.

Well, if you really need to use that terminal you can always open the console, click the terminal and type "unlock".

Unfortunately that flags you as a cheater in game, so all NPC's will attack you on sight, the game corrupts all your save data and finally the game sends your personal data to Obsidian so a bunch if random developers will come over to your house at night, destroy your kneecaps with blunt objects and set your balls on fire as punishment for not enjoying the game the way they intended it.